feat: 新增Android平台支持及构建流程

集成Android平台相关目录与配置文件，包含Gradle构建脚本、资源文件、启动图标、Java入口、Proguard规则等，完善.gitignore以排除Android构建产物。更新CI流程，支持自动构建并发布Android APK。移除README中项目结构说明，简化文档。

package.json

@@ -9,7 +9,7 @@
   },
   "private": true,
   "version": "1.4.0",
-  "buildDate": "2025/12/19 12:29:46",
+  "buildDate": "2025/12/20 00:39:08",
   "main": "dist-electron/main.js",
   "type": "module",
   "scripts": {
@@ -17,9 +17,14 @@
     "build": "vue-tsc -b && vite build && node update-build-date.js",
     "preview": "vite preview",
     "build:server": "pnpm run build && go build",
-    "build:electron": "cross-env ELECTRON_BUILD=1 pnpm run build && electron-builder"
+    "build:electron": "cross-env ELECTRON_BUILD=1 pnpm run build && electron-builder",
+    "build:android": "pnpm run build && npx cap sync android",
+    "build:apk": "pnpm run build:android && cd android && ./gradlew assembleRelease"
   },
   "dependencies": {
+    "@capacitor/android": "^8.0.0",
+    "@capacitor/cli": "^8.0.0",
+    "@capacitor/core": "^8.0.0",
     "@tailwindcss/vite": "^4.1.17",
     "@tanstack/vue-table": "^8.21.3",
     "@vueuse/core": "^14.1.0",
@@ -50,6 +55,8 @@
     "electron": "^39.2.7",
     "electron-builder": "^26.0.12",
     "electron-vite": "^5.0.0",
+    "postcss": "^8.5.6",
+    "postcss-preset-env": "^10.5.0",
     "tailwind-merge": "^3.4.0",
     "tw-animate-css": "^1.4.0",
     "typescript": "~5.9.3",